Pregnancy test addicts out there..?

Jen • Mama to Savannah, born on 10.12.17
Quick question... I had a miscarriage in October so when we found out we were pregnant again about 5 weeks ago, I've been taking tests everyday. I take the easy@home ones from amazon and I've taken a couple first response tests here and there. The test line gradually got darker which obviously was comforting. But now the test lines have been lighter, but they're staying the same. They aren't gradually getting lighter but they aren't as dark as they used to be. I don't have concerning cramping or bleeding so I'm not too worried, but has this happened to any other pregnancy test addicts out there? I've also noticed that my urine isn't as dark as it was first either so maybe that makes a difference. My quick question wasn't so quick lol sorry about that!